# Fermat's Spiral

## Description

Also called a parabolic spiral, it is a type of Archimedean Spiral. A spiral is defined as "a plane curve which runs continuously round and round, a fixed point, called the center, with constantly increasing radius vector, so that the latter is never normal to the curve; also, a part of such a curve in the course of which the radius from the center describes 360 degrees." —Whitney, 1889

## Keywords

Archimedean Spiral, Archimedes, Fermat's spiral, parabola, parabolic spiral, Pierre de Fermat, radius vector, spiral, spirals

## Galleries

## Source:

William Dwight Whitney, PhD, LLD *The Century Dictionary: An Encyclopedic Lexicon of the English Language* (New York, NY: The Century Co., 1895) 5839